22419921 has 4 divisors (see below), whose sum is σ = 29893232. Its totient is φ = 14946612.

The previous prime is 22419919. The next prime is 22419967. The reversal of 22419921 is 12991422.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22419921 - 2¹ = 22419919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22419421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3736651 + ... + 3736656.

It is an arithmetic number, because the mean of its divisors is an integer number (7473308).

Almost surely, 2^22419921 is an apocalyptic number.

It is an amenable number.

22419921 is a deficient number, since it is larger than the sum of its proper divisors (7473311).

22419921 is an equidigital number, since it uses as much as digits as its factorization.

22419921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7473310.

The product of its digits is 2592, while the sum is 30.

The square root of 22419921 is about 4734.9678985184. The cubic root of 22419921 is about 281.9754895452.

The spelling of 22419921 in words is "twenty-two million, four hundred nineteen thousand, nine hundred twenty-one".